Modeling character in side view
I took a look at your blend file. If I understand correctly you want to model a the little guy with faces. You started by the front and have trouble continuing on with the sides. I have provided you the modified blend file. Please check it out and tell me if you find anything interesting.

I have fixed the extrusion you've made. It seems like you selected the wrong faces to extrude. What you need to do is select vertices you want to extrude, hit E and pull them back towards the back of the head. 

Again if that wasn't the answer you were looking for, don't hesitate to tell me and I will help.

blender file download link



Some tips:


when extruding you can snap vectices to other vertices by pressing
Ctrl. Your vertex will then snap to the nearest vertex. wiki extrude tool
avoid having Ngons by keeping all faces as rectangles. This will help you model the little man.
You can select all model and click on W then click on Remove doubles


EDIT

Ok so the video tells you to model the general shape of the face in 2D, then at 11:10 he starts giving it depth by pulling forward some vertices. It's very easy: Be careful to have your side reference placed in the middle like so: then select one vertice from the "middle line": 

And pull it foward on the Y axis. until it maches your reference.

Repeat this select/pull process for each vertice of this line.